DOC Added return value info to SimpleImputer.transform docstring (#20005)
DOC Added return value info to SimpleImputer.transform docstring (#20005)

Co-authored-by: Thomas J. Fan <5e8796a332fafc9c261437cd1787ae2709a896a7@gmail.com>
Co-authored-by: Guillaume Lemaitre <e5e78d384e205244ed69377c80930de68a2732ec@gmail.com>
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